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| Potential 11 1/8" Brake Upgrade for 88 Fieros with Stock 15" Wheels (Page 2/4) |
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wftb
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NOV 23, 06:11 PM
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On the front of my car I use a Lebarron front rotor instead of the commonly used rear rotor. This rotor is slightly lighter, still about 11" in diameter but of course it is 5X100 bolt pattern like a Fiero. It does not have a parking brake hat like the rear rotor does. There are 2 minor drawbacks that are easy to deal with: You have to shim your mounting bracket to get the rotor centred in the caliper and the centre hole is slightly smaller than the fiero hub. This is easily fixed with a cylinder hone fitted with some rough sandpaper resulting in a perfect fit.
When I ordered this rotor it took a couple of tries to get the right one. There are 4 different rotors used on Lebarron's because some models had 14" wheels and were equipped with smaller rotors.[This message has been edited by wftb (edited 11-23-2018).]
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fieroguru
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NOV 23, 07:35 PM
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| quote | Originally posted by wftb:
On the front of my car I use a Lebarron front rotor instead of the commonly used rear rotor. This rotor is slightly lighter, still about 11" in diameter but of course it is 5X100 bolt pattern like a Fiero. It does not have a parking brake hat like the rear rotor does. There are 2 minor drawbacks that are easy to deal with: You have to shim your mounting bracket to get the rotor centred in the caliper and the centre hole is slightly smaller than the fiero hub. This is easily fixed with a cylinder hone fitted with some rough sandpaper resulting in a perfect fit.
When I ordered this rotor it took a couple of tries to get the right one. There are 4 different rotors used on Lebarron's because some models had 14" wheels and were equipped with smaller rotors.
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The LeBaron front rotors won't fit over the 88 Front wheel flange.
If you use the rear rotors, you have to machine the backside of the rotor, and machine the face of the caliper bridge... so no Lebaron rotors are in the mix.
Only modifications I want for the rotors is drilling the 5x100 pattern.
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liv4God
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NOV 23, 11:36 PM
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Would the calipers work on your 13" kit without additional modification to utilize the bigger pistons and better leverage of caliper X?
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fieroguru
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NOV 24, 10:51 AM
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| quote | Originally posted by liv4God:
Would the calipers work on your 13" kit without additional modification to utilize the bigger pistons and better leverage of caliper X? |
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The short answer is no. The body of Caliper X is taller than the stock 88 caliper, so when you install Caliper X, you also need to install a larger rotor to keep the brake pad on the rotor surface. The larger rotor may or may not use the same concentric rings, but that is a relatively minor issue to resolve.
In theory, you could install Caliper X on the existing 13" brackets and run a 13.8" rotor. The issue is that 13" is the maximum diameter rotor that will fit under the caliper, clear the edges of the caliper bridge, and keep the pad on the rotor. Go larger and the edge of the brake pad will hang off the end of the rotor due to the shallower curvature of the larger rotor. I have identified a 13.8 rotor application that would likely fit the 88 Fiero suspension, but I am almost certain the brake pad will be off the edge when used with the stock 88 caliper.
People with 12" brake kits using the 88 Fiero caliper (84-87 Fieros & 88 Fiero) could use Caliper X to install a roughly 12.8" rotor while using the same brackets. There are 2 rotors I have identified as potentials for this application. The challenge here is the various designs of the 12" brackets. There is roughly 1/8" freedom of caliper placement between the rotor clearing the caliper bridges, and keeping the brake pad on the rotor. So some might work and some might not, it all depends on who designed the bracket and how they determined optimal placement.
There are also 14", 14.4" and 15.5" rotors I have identified that would likely clear the 88 suspension components and are thin enough for Caliper X to clamp, but are too large to keep the pad on the rotor surface.
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Mark A. Klein
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NOV 29, 09:15 PM
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fieroguru
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JUN 27, 03:47 PM
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Here is what I am calling Caliper Y.
It is a 1999+ caliper from the same OEM as Caliper X and bolts directly to the 88 FIero knuckle. It is 52mm (17% increase in clamp pressure and will allow a slightly larger rotor.
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blackrams
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JUN 28, 07:54 AM
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I applaud and appreciate your efforts to continue to improve these fun little rides. What you do, you do so well. Keep it up.
Rams
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qwikgta
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JUL 09, 06:21 PM
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| quote | Originally posted by blackrams:
I applaud and appreciate your efforts to continue to improve these fun little rides. What you do, you do so well. Keep it up.
Rams |
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Like, Like, Like. Thanks from all of us "88" folks out here.
Rob
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anaverin
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JUL 09, 07:39 PM
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does this mean your close to a new kit?
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GTFiero1
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JUL 12, 09:48 PM
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I've kept an eye on brakes of some cars for possible conversions, havent physically tried putting parts together but
Ford Transit 250 (2017ish) rear calipers have integrated parking brake, a 54mm piston, and are cheap. They sit on a 12.1" solid rotor -that being not compatible in any way. The Caliper bracket width for the rotor is 18mm, so a somewhat thin rotor would have to be utilized.
A 2010 WRX STI rear rotor is 12.4" at 20mm thick. Could be turned down to 18 (its minimum thickness), or maybe transit caliper bracket opened up slightly.
2007 GTI rear rotor is 11.26" at 12mm wide. Unsure if the Transit caliper piston can make up that 6mm distance, and if the caliper would sit ok on a rotor 3/4" smaller diameter.
Just out loud thinking and this could all be useless information
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